US8502533B2 - Combined imaging system, including a magnetic resonance system and a UWB radar - Google Patents
Combined imaging system, including a magnetic resonance system and a UWB radar Download PDFInfo
- Publication number
- US8502533B2 US8502533B2 US12/875,197 US87519710A US8502533B2 US 8502533 B2 US8502533 B2 US 8502533B2 US 87519710 A US87519710 A US 87519710A US 8502533 B2 US8502533 B2 US 8502533B2
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- US
- United States
- Prior art keywords
- signal
- magnetic resonance
- uwb
- radar
- imaging system
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/86—Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
- G01R33/4808—Multimodal MR, e.g. MR combined with positron emission tomography [PET], MR combined with ultrasound or MR combined with computed tomography [CT]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/0209—Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
Definitions
- the invention relates to a combined imaging system, including a magnetic resonance system and a UWB radar, for generating recordings of an examination region of an examination object.
- the invention also relates to a method for operating a combined imaging system of this type.
- Magnetic resonance tomography also known as nuclear spin tomography
- a magnetic resonance recording of an examination object the body and/or the body part of the patient to be examined must initially be exposed to as homogeneous and static a base magnetic field as possible (generally referred to as B 0 -field), which is generated by a base field magnet of the magnetic resonance system.
- B 0 -field a base magnetic field as possible
- rapidly switching gradient fields for spatial encoding are superimposed onto this basic magnetic field, said gradient fields being generated by so-called gradient coils.
- HF signals for instance a high frequency pulse or a high frequency pulse sequence, of a defined field strength are irradiated into the examination volume using a high frequency antenna, in which examination volume the examination object is located.
- This HF field (generally referred to as B 1 field) excites the nuclear spin of the atoms in the examination object such that they are moved from their equilibrium position, which runs parallel to the base magnetic field, and rotate about the direction of the base magnetic field.
- the magnetic resonance signals generated as a result are received by high frequency receiver antennae.
- the receiver antennae can either be the same antennae with which the high frequency pulses are emitted, or can be separate receiver antennae.
- the magnetic resonance images of the examination object are finally created on the basis of the received magnetic resonance signals.
- a magnetic resonance system which forms part of a combined imaging system according to the invention, is known for instance from the patent application DE 10 2007 057 495 A1.
- a medical imaging method known as a “UWB radar” is also known, with which images of a living examination object can likewise be obtained.
- the examination object is irradiated with wideband electromagnetic low-power pulses, which penetrate into the examination object and are partially reflected onto boundary layers of tissue types with different dielectric properties.
- the UWB signal is herewith generated by a UWB signal generator and is radiated into the examination room by way of an antenna.
- a receiver antenna in conjunction with a receiving facility thereupon receives a UWB echo signal from different depths of the examination object.
- a display of these biological processes is possible by means of a movement of the boundary layers between the tissue types, which is caused by breathing or the heartbeat.
- U.S. Pat. No. 5,668,555 discloses a UWB radar for examining an examination object, in which a pulse sequence is sent out to the examination object and the signals reflected thereupon by the examination object are received and evaluated. It is also possible on the basis of this measuring principle to generate image data from the examination object.
- the combination of the two imaging methods enables examinations to be carried out in real-time on living examination objects and the heartbeat or the breathing to be displayed for instance.
- a combined imaging system comprising a magnetic resonance system and a UWB radar is disadvantageous in that the signals generated by the respective system can effect interferences in the received signal of the respective other signal.
- the object of the present invention is to reduce the interference signal caused in the received signal of the one system by the respective other system.
- the combined imaging system includes a magnetic resonance system and a UWB radar, for generating recordings of an examination region of an examination object, with the magnetic resonance system including a high frequency facility for transmitting high frequency signals into the examination region and for receiving magnetic resonance signals emitted thereupon from the examination region, with the UWB radar including a radar signal facility for transmitting radar signals into the examination region and for receiving UWB echo signals reflected thereupon from the examination region and with imaging means being present for generating image data of the examination region based on the magnetic resonance signals and the UWB echo signals.
- the magnetic resonance system including a high frequency facility for transmitting high frequency signals into the examination region and for receiving magnetic resonance signals emitted thereupon from the examination region
- the UWB radar including a radar signal facility for transmitting radar signals into the examination region and for receiving UWB echo signals reflected thereupon from the examination region and with imaging means being present for generating image data of the examination region based on the magnetic resonance signals and the UWB echo signals.
- interference signals effected by the UWB radar can also be contained in the magnetic resonance signal received by the magnetic resonance system.
- the invention provides for the use of filter means, in order to filter out interference signal parts caused by the UWB radar in the magnetic resonance signal and/or by the magnetic resonance system in the UWB echo signal.
- the filtering process improves the quality of the magnetic resonance signal received by the magnetic resonance system and/or the UWB echo signal received by the UWB radar.
- the filter means are advantageously embodied as adaptive filters or include adaptive filters, which are able to automatically adjust themselves to different interference signals.
- the gradient coil signal and/or the high frequency antenna signal and/or the radar signal are fed to the filter means. This enables the filter parameters to be optimally adjusted in order to reduce the interference signal parts.
- vibration sensors are provided for detecting vibrations of components in the magnetic resonance system and the patient support apparatus.
- the sensor signals obtained therefrom are also advantageously fed to the filter means for optimized determination of filter parameters.
- interference signal parts in the UWB echo signals which are effected by vibrations of components of the magnetic resonance system, can as a result be largely eliminated.
- FIG. 1 shows a combined imaging system having a magnetic resonance system and a UWB radar in a very simplified, schematic representation and
- FIG. 2 shows a schematic representation of a filter for a UWB echo signal.
- FIG. 1 shows a very simplified schematic representation of the essential components of a combined imaging system, which includes a magnetic resonance system and a UWB radar.
- the magnetic resonance system comprises an essentially hollow cylindrical base unit 1 , in the cavity of which is located a patient recording space (a gantry).
- a patient support apparatus 5 on which a patient 5 to be examined rests, can be moved into the gantry.
- an electrical gradient pulse signal G is generated by means of a signal generator 11 and a gradient pulse amplifier 6 , amplified and fed to the gradient coils 2 .
- electrical high frequency pulse signals RF are generated by the signal generator 11 and a high frequency pulse amplifier 7 , amplified and fed to high frequency pulse antennae 3 . These thereupon radiate high frequency fields.
- magnetic resonance signals are given off by the patient 5 , received by the high frequency pulse antennae 3 and fed to an MR receiver unit 20 . This converts the received signals into an electrical MR signal.
- the combined imaging system includes a UWB radar 9 with a transmit and receive antenna 10 .
- the UWB radar 9 generates a UWB signal and transmits this via the transmit and receive antenna 10 into the examination room.
- a resulting UWB echo signal is likewise detected from the examination room by way of the transmit and receive antenna 10 and an electrical UWB echo signal UWBE is obtained.
- the combined imaging system includes filter means for reducing and/or eliminating these interference signal parts.
- the UWB signals generated by the UWB radar 9 and given off into the examination room can also effect interference signal parts in the MR signal obtained by the MR receiver unit 20 of the magnetic resonance system.
- the invention also provides for filter means 21 , in order to filter out interference signal parts from the MR signal.
- FIG. 2 A schematic representation of the filter 8 for eliminating the interference signal parts contained in the electrical UWB echo signal UWBE is shown in FIG. 2 .
- the electrical UWB echo signal UWBE received by the UWB radar 9 by way of the antenna 10 and if necessary further processed is fed to a filter 8 and in particular the positive input of a multiple subtractor 18 .
- Interference signal parts caused by the magnetic resonance system are contained in this electrical UWB echo signal UWBE.
- the gradient pulse signal G from which the signal for feeding the gradient coil 2 emerges after an amplification
- the high frequency pulse signal RF from which the signal for feeding the high frequency pulse antennae 3 of the magnetic resonance system emerges, are also fed to the filter.
- a sensor signal S is also fed to the filter 8 , said sensor signal being generated by a vibration sensor 10 fastened to or near to the base unit 1 of the magnetic resonance system.
- Adaptive filters 12 , 13 and 14 within the filter 8 are adjusted such that the gradient coil pulse signal G filtered with the filter 12 , the high frequency pulse signal RF filtered with the filter 13 and/or the sensor signal S filtered with the filter 14 are each subtracted from the electrical UWB echo signal, so that interference signal parts contained in the electrical UWB echo signal UWBE, which result from the gradient pulse coil signal G and/or the high frequency pulse signal RF and/or the vibrations of the base unit 1 , are at least largely eliminated.
- the filtered signals G, RF and S are in particular fed to the negative inputs of the multiple subtractor 18 .
- adaptive filters 12 , 13 and 4 enable the filter settings to be automatically adjusted to changing “interference signals” G, RF and S. Furthermore, it is possible to influence the adaptation of the adaptive filters 12 , 13 and 14 by means of the feedback control elements 15 , 16 and 17 . For instance, the adaptation speed can be controlled by the feedback control elements 15 , 16 and 17 , by the output signal UWBE′ being multiplied therein with an adaptation factor. For instance, the ratio between accuracy and speed of the adaptation can thus be influenced.
- the interference signal parts contained in the electrical UWB echo signal UWBE are at least largely eliminated in the resulting echo signal UWBE′. According to the same principle, further interference signals can also be eliminated from the wanted signal, said interference signals being effected by vibrations in the patient support apparatus for instance and being detected by way of a further sensor (not shown).
- the filter 21 is also configured according to FIG. 1 , as a result of which it is possible to dispense with a more accurate representation.
- the MR signal given off by the MR receiver unit appears in particular as a faulty input signal, from which the interference signal parts generated by the UWB radar 9 , which originate from the UWB signal fed to the antenna 10 and/or from the resulting UWB echo signal, are filtered out.
- An interference signal-free and/or interference signal-reduced signal MR′ results.
- interference signal-reduced and/or interference signal-free signals UWBE′ and MR′ are then fed to a signal processing unit 22 for further processing and in particular for image generation, said signal processing unit calculating image data from the signals.
- the structure shown by way of example in FIG. 1 and/or the filter arrangement shown by way of example in FIG. 2 enables the negative mutual influence of the received signals to be at least largely eliminated when operating the different imaging systems at the same time in the case of a combined imaging system having a magnetic resonance system and a UWB radar. As a result, advantages which enable a combined operation of the two imaging systems can be completely exploited.
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Pulmonology (AREA)
- Radiology & Medical Imaging (AREA)
- Theoretical Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims (11)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009041263 | 2009-09-11 | ||
DE102009041263A DE102009041263A1 (en) | 2009-09-11 | 2009-09-11 | Combined imaging system comprising a magnetic resonance system and a UWB radar |
DE102009041263.8 | 2009-09-11 |
Publications (2)
Publication Number | Publication Date |
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US20110062958A1 US20110062958A1 (en) | 2011-03-17 |
US8502533B2 true US8502533B2 (en) | 2013-08-06 |
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US12/875,197 Expired - Fee Related US8502533B2 (en) | 2009-09-11 | 2010-09-03 | Combined imaging system, including a magnetic resonance system and a UWB radar |
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US (1) | US8502533B2 (en) |
DE (1) | DE102009041263A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103376428B (en) * | 2012-04-26 | 2015-09-02 | 上海联影医疗科技有限公司 | Signal transmitting apparatus and magnetic resonance imaging system |
DE102014208537A1 (en) * | 2014-05-07 | 2015-11-12 | Siemens Aktiengesellschaft | A magnetic resonance device with a motion detection unit and a method for detecting a movement of a patient during a magnetic resonance examination |
CN111337920B (en) * | 2020-03-03 | 2022-07-15 | 成都金宇防务科技有限公司 | Missile-borne radar ground detection method and device for preventing cloud and fog interference |
CN111493869A (en) * | 2020-04-10 | 2020-08-07 | 南京四十二科技有限公司 | Ultra-bandwidth radar navigation imaging system and method based on respiratory signals |
CN111474508B (en) * | 2020-04-10 | 2021-06-01 | 南京四十二科技有限公司 | Navigation body motion imaging system and method based on ultra-bandwidth radar |
CN111493862A (en) * | 2020-04-10 | 2020-08-07 | 南京四十二科技有限公司 | Ultra-bandwidth radar navigation imaging method based on electrocardiosignals |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0429190A2 (en) | 1989-11-21 | 1991-05-29 | Picker International, Inc. | Non-invasive examination apparatus and methods |
US5155683A (en) * | 1991-04-11 | 1992-10-13 | Wadiatur Rahim | Vehicle remote guidance with path control |
US5504714A (en) * | 1995-02-24 | 1996-04-02 | The United States Of America As Represented By The Secretary Of The Navy | Acoustic and environmental monitoring system |
US5668555A (en) | 1995-09-01 | 1997-09-16 | Starr; Jon E. | Imaging system and apparatus |
DE102007057495A1 (en) | 2007-11-29 | 2009-06-18 | Siemens Ag | Radio frequency (RF) transmission device for magnetic resonance system has labeling transmission antenna coupled with RF amplifier so that RF amplifier supplies RF signals having predetermined RF transmission power |
US20110066027A1 (en) * | 2009-09-11 | 2011-03-17 | Wilfried Schnell | Combined Imaging System with a Magnetic Resonance System and a UWB Radar |
-
2009
- 2009-09-11 DE DE102009041263A patent/DE102009041263A1/en not_active Withdrawn
-
2010
- 2010-09-03 US US12/875,197 patent/US8502533B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0429190A2 (en) | 1989-11-21 | 1991-05-29 | Picker International, Inc. | Non-invasive examination apparatus and methods |
US5155683A (en) * | 1991-04-11 | 1992-10-13 | Wadiatur Rahim | Vehicle remote guidance with path control |
US5504714A (en) * | 1995-02-24 | 1996-04-02 | The United States Of America As Represented By The Secretary Of The Navy | Acoustic and environmental monitoring system |
US5668555A (en) | 1995-09-01 | 1997-09-16 | Starr; Jon E. | Imaging system and apparatus |
DE102007057495A1 (en) | 2007-11-29 | 2009-06-18 | Siemens Ag | Radio frequency (RF) transmission device for magnetic resonance system has labeling transmission antenna coupled with RF amplifier so that RF amplifier supplies RF signals having predetermined RF transmission power |
US20110066027A1 (en) * | 2009-09-11 | 2011-03-17 | Wilfried Schnell | Combined Imaging System with a Magnetic Resonance System and a UWB Radar |
Non-Patent Citations (1)
Title |
---|
F. Thiel, M.A. Hein, J. Sachs, U. Schwarz, F. Seifert; "Physiological signatures monitored by ultra-wideband-radar validated by magnetic resonance imaging", Proc. IEEE ICUWB 2008, vol. 1, pp. 105-108. |
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Publication number | Publication date |
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US20110062958A1 (en) | 2011-03-17 |
DE102009041263A1 (en) | 2011-03-24 |
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